ProPull says this about the ProPull Disc Speed Trainer:
By grabbing our ProPull Disc exactly as you would on the course as you go through the workouts you will train your body to increase acceleration in the exact angles and positions related to your throwing motion. Whatever your current form is, use the ProPull to work on your acceleration from the reach back through release and you will get 7-8 more feet of distance than you have now, for every 1 MPH of increased disc speed.
Specially Designed ProPull Training Disc
5lb Resistance Band
8lb Resistance Band
Tree Strap for outside use
Door Anchor for inside use
13' X 11' Durable ProPull Bag